Electric lighting fitting having the lamp and control elements therefor removable as a unit



F. L. CA'ITYOR ETAL ELECTRIC LIGHTING FITTING HAVING THE LAMP AND CONTROL Feb. 5, 1952' ELEMENTS THEREFOR REMOVABLE AS A UNIT Filed July 30, 1946 mu MN 80 6. p w 0 n S c h I P .T .oL ..Wt t m mmm A nan w T T. Uu D Q- N- m l 3 HH 5% K M Patented Feb. 5, 1952 FFICE.

ELECTRIC LIGHTING FITTING HAVING THE LAMP AND CONTROL ELEMENTS THERE- 3 FOR REMOVABLE AS A UNIT Frederick L. Cator, Olton, and Frederick William Thorpe, Birmingham, England, assignors to General Electric New York Company,v a corporation of Application July 30, 1946, Serial No. 687,198

In Great Britain August 3, 1944 Section 1, Public Law 690, August s, 1946 Patent expires August 3, 1964 1 Claim. (01. 240 11.4)

A .ZIhis inventionrelates to electric li'ghtine' tings adapted for use in theopen, where hey are exposed to the weather, and particularly to street lighting fittings. The invention is especially concerned with totally enclosed fittings provided with a side entry for the supply conductors and for supporting the fitting.

The object of the invention is to provide a construction of such fittings which is simple to manufacture and install, and the interior of which is I readily accessible for cleaning.

= Atotally enclosed side entry electric lighting fitting, according to'theinvention,comprises a base member of ring. formationadapted to receive a translucent or transparent bowl or like light controldevice which encloses the lower face .thereof, the base member having at its periphery hollow means for attaching it-to a support and for leading supply conductors thereinto, a cover member hinged to thesupport and adapted to enclose the upper face of the base member, and

a detachable lighting unit fitting into the base member and including the source of light.

The source of light preferably consists of electricdi'scharge lamp which is horizontally mounted lprovidea liehtine uni om ris u member onto which the discharge lamp and control elements are mounted, the control elements being above the sub-basemember and the lamp I below it. The lamp ismounted in a socket so connected t6 the sub base member that the lamp lies.,parallel thereto. .Aborethe lamp andbelow ithe.sub-base.memberwe pr vid a refl c r uit- .ablyi. shaped .to,. d irect. 'the light from,,the lamp downwardlythrough thegbowll The control elements mounted above the sub-base member may consist of a series choke and condenser suitably connected, the choke being arranged to provide a magnetic field to maintain the arc in the lamp centrally within the envelope in a manner well known per se. The sub-base member may be provided with a handle to enable it readily to be removed from the base member.

In order to isolate the lighting unit from vibration, the sub-base member is preferably supported on springs or other resilient means which are located in suitable channels or lugs extending from the base member, the springs being engaged 'by extensions from the sub-base member. By

thus supporting the lighting unit, we ensure that the relative positions of the lamp and its reflector remain unchanged with any small relative movement between the sub-base member and the main base a support member.

We will now describe, with reference to the accompanying drawing, an embodiment of the in vention, the drawing showing the said embodiment in cross section.

Referring to the drawing We have illustrated a base member 1 having at its periphery a hollow clamping member or mounting bracket 2 adapted to be secured to a suitable support which may be the termination of a concrete or other pillar. The base member I is shaped in accordance with the desired form of the fitting in plan, e. g., if the fitting is circular in plan the base member will consist of an annular support while for a rectangular fitting the base member will be in the form of a hollow rectangle. For the use to which the present fitting is adapted a rectangular form of base member is preferred. At the upper side of the clamping member 2 is formed a hinge c0nnecti0n 3 for the upper cover member 4 of the fitting. The hinge may be formed in any convenient manner, for example, by

means of two lugs arranged to receive the pin gasket 5 serves to provide a'moisture tight joint between the cover member 4 and the base. I

The lower face of the base member I is enclosed by a translucent bowl 6. This is shown as being provided on its inner face with refract- 6 maybe directly supported on the base "member! for example by having a peripheral projection adapted to engage with a ledge formed on the lower rim of the base member I. However, in the embodiment illustrated we support the bowl on a lower ring 8 hinged at 9 on the projection 2 so that the bowl can readily be lowered if desired for cleaning purposes. The hinge is shown as being so constructed that after the ring 8 has been swung away from the base member to a predetermined angular degree, the ring may be detached from the hinge pin on which it is supported. To this end the hinge is formed by a projection in on the ring 8, the projection being provided with a slot ll so angularly positioned that it is only releasable from the pin when the ring 8 is swung round to an angle somewhat greater than 90. A grub screw i2 may be inserted to obscure the end of the slot H and prevent removal of the ring 8 until the screw has been removed.

The bowl 6 is provided with a U-shaped slot in its periphery at 13 to allow for the position ing of the holder M for a lamp IS. The lamp I is of the electric discharge type and is horizontally mounted in the fitting. To maintain the are centrally within the lamp envelope, magnetic arc control coils 15 are provided in known manner. These are supported on the upper face of a sub-base member I? from the lower face of which the holder 54 and the lamp I5 are supported. The sub-base member I? may also support a reflector IS. A power factor control condenser IQ is supported midway between the magnetic control devices it. The outer end of the lamp I5 may be supported from the sub-base member ll by a spring clip 22. By the use of the sub-base assembly for the lamp and magnetic control devices and the reflector these parts are held in accurate relationship with one another.

The sub-base member parts is removable as a whole from the fitting when the cover member 4 is raised to expose the interior thereof and has a handle 2! provided for this purpose. The sub-base member I! also supported resiliently within the fitting by providing it with lugs 22 of which there may be four in number, two at each end, these lugs being supported on shock absorbing supports indicated as springs 23 set in sockets 24 mounted on" the base member I. On the closure of the cover member 4 the inner face thereof is adapted to bear on the handle 2! and compress the springs 23 thereby positioning the sub-base member and its associated devices within the fitting. A felt Y pad 25 is preferably located beneath the cover member 4 to engage the handle 2| to assist in the resilient support of the sub-base member IT.

Compression of the springs may be rendered ad iustable by means of an adjusting screw 26 mounted on the handle of the side which engages the pad 25. f

The hollow mounting bracket 2 also provides a means for the entry of supply conductors 21 in the fitting. The supply conductors are taken to a connecting plate 28 the terminal screws 29 on which are accessible by removing a cover plate fixed on the outside of the clamping member. Connections from the terminals 29 are taken to a two-part detachable plug connector 30, 30a which provides the necessary releasable connection between the detachable sub-base assembly n with its associated isI It will thus be seen that we have provided a which are capable of being readily removed, the complete lighting unit being removable from the inside of the fitting when the cover 4 is hinged open, whilst the bowl alone may be cleaned by hinging back the ring 8.

What we claim 'as new and desire to secure by Letters Patent of the United States is:

- A totally enclosed side entry electric lighting fitting comprising, a base member of ring formation having interior mounting seats fixed thereto, a hollow mounting bracket attached to the periphery of said base member and extending radially outward therefrom, a first electric plug connector mounted within said bracket, a light transmitting'closure member hingedly mounted upon said bracket and arranged to enclose one face of said base member, a sub-base resiliently mounted upon said interior seats and extending diametrically across the interior of said ringshaped base member, an elongated reflector fixed to said sub-base on the side adjacent said closure member and disposed diametrically across said base member, a lamp receptacle supported by said sub-base in a position to'mount an elongated arc discharge lamp in parallel spaced relation with said reflector, a second electric plug connector electrically connected to said lamp mounting receptacle and adapted to cooperate with said first plug connector, electric arc control means mounted upon the other side of said sub-base in position to control the arc in said discharge lamp, and a cover member hingedly mounted upon said bracket and arranged to enclose the other face of said base member, whereby, said sub-base divides said totally enclosed fitting into a lower lamp compartment and an upper control compartment and constitutes with said lamp reflector and receptacle and said control means an integral lighting unit removable from said base member without disassembly.

FREDERICK L. CATOR. FREDERICK WILLIAM THORPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

